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There are some junk AR build videos on Youtube, so beware.
Here is what I consider to be the best, free AR Build Video series.
Professionally done by a gunsmith...
https://www.brownells.com/guntech/how-to-build-an-ar/index.htm
While better than most, there are still holes in the Brownells videos. The lack of AEROSHELL 33MS (or other anti-seize compound, like Loctite C5a) on the barrel and castle nuts come to mind as does the uber weak stacking.
I would suggest downloading a copy of AR TM 9-1005-319-23&P - I believe Nov 2008 is the latest and use both the videos and the tech manual.